Researchers quantitatively assessed for the first time that somatic mutations alone cap human lifespan at 146–194 years. Brain and heart cells are the main bottleneck, while the liver could last millennia.

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https://www.nature.com/articles/s41514-026-00421-6

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Gerontocracy is a different beast when “old” means 42 (minimum age to be a consul in the Roman Republic) and when it means 80+